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PostPosted: Apr 11th, '18, 03:34 
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I am building my first small aquaponics system in a greenhouse in the Netherlands.
I have been reading and watching video's about aquaponics the entire winter, I dug in my fishtank and sump and build the growbeds. The time slowly aproaches to add fish, or at least reserve them at a dealer.
But how many? I have read so many different things that I dont know anymore, ranging from 10 to 60 fish for an IBC system.

My fishtank is 800 litres, sump is 240 litres (pump in sump). Main growbed is 250-275 litres, one growbed of 50 litres, A raft bed 50 litres / 30cm by 60 cm surface, and a 2 meter standpipe for strawberry's. Oh and there are some edible waterplants in/above the fishtank. growbeds wil cycle 5 times an hour, and I have a strong air pump and six large bubble stones to add plenty of air.
I will be adding Grasscarp, they can handle high temperature in the greenhouse in the summer and low temperature in the winter.
The dealer has fish available of 7-10 cm, how many would you put in?

Thanx in advance for the advice!


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PostPosted: Apr 11th, '18, 08:22 
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It all comes down to bio-filtration capacity.

Use a Wet Gravel:Fish ratio of 20L:1 for slow growing fish, 25L:1 for fast growing fish such as Trout.

This ratio will give you a safe fish stocking capacity through to a size of 500gm each. You could stock at a higher rate when they are smaller, so as to make more nutrient available to the plants, but you will need to move some fish out of the system as they grow and your system reaches it's maximum safe capacity.

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PostPosted: Apr 11th, '18, 11:30 
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Yep, what damage says.
But, size of the fish tank is also relevant, all well and good having a biofilter able to process 100 fish but I wouldn't put 100 fish into an ibc and expect them to happily live.
I have 60 fish in a 3000l tank and it looks crowded.
I think 20 fish max in an ibc is the limit but I've seen much more unfortunately. Stagger the sizes and only add a few to begin with. ;)

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PostPosted: Apr 11th, '18, 12:06 
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Hi Giel, welcome to the forum (another Dutchy).

Hoi Giel, welkom op dit forum (een andere Nederlander)


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PostPosted: Apr 12th, '18, 02:57 
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Thanx for the explanation!
So in my case 15, 16 or 17 fish would be ok. (unless they get bigger than 500 grams)
Do I understand correctly that the system will be "safer" or "less volatile" if I put in less fish, for example 12?

Hey Wilsil thanx for the welcome! groeten uit brabant!


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PostPosted: Apr 12th, '18, 19:03 
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To all those points you should also consider how mature your GBs are and how many and what stage the plants are. The more fish the higher the capacity to chew nutes is required.

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PostPosted: Apr 13th, '18, 16:24 
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my case 18, 16 or 17 fish would be ok.
and I have 60 fish in a 2000l tank and it looks crowded.

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